return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress requires PHP version 4.3 or higher and MySQL version 4.1.2 or higher. You are running PHP version %1$s and MySQL version %2$s.'), $php_version, $mysql_version ) );

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return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress requires PHP version %1$s or higher and MySQL version %2$s or higher. You are running PHP version %3$s and MySQL version %4$s.'), $php_required, $mysql_required, $php_version, $mysql_version ) );

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elseif ( !$php_compat )

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return new WP_Error( 'php_not_compatible', sprintf( __('The update cannot be installed because WordPress requires PHP version 4.3 or higher. You are running version %s.'), $php_version ) );